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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/26128] Trivial operation not vectorized on char/short
Date: Fri, 13 Jul 2012 14:06:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26128

Richard Guenther <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
      Known to work|                            |4.5.4, 4.8.0
         Resolution|                            |FIXED
   Target Milestone|---                         |4.5.0
      Known to fail|                            |4.4.6

--- Comment #6 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-07-13 14:05:50 UTC ---
Making the testcase actually compile like

char a[16] __attribute__((aligned(16))) = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11,
12,
    13, 14, 15, 16};
char b[16] __attribute__((aligned(16))) = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11,
12,
    13, 14, 15, 16};
char c[16] __attribute__((aligned(16)));

int main()
{
  int i;

  for(i = 0; i<16; i++)
    {
      c[i] = a[i] + b[i];
    }

  for(i = 0; i<16; i++)
    {
      printf("%i ", c[i]);
    }
}

shows:

c> /space/rguenther/install/gcc-4.5.4/bin/gcc -O3 t.c
-ftree-vectorizer-verbose=1
t.c: In function 'main':
t.c:18:7: warning: incompatible implicit declaration of built-in function
'printf'

t.c:11: note: LOOP VECTORIZED.
t.c:7: note: vectorized 1 loops in function.


Thus fixed, in GCC 4.5.